diff --git a/tox.ini b/tox.ini
index 8eb0a1f..9edd780 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,7 @@ commands =
     /usr/bin/find . -type f -name "*.pyc" -delete
 passenv =
     HOME
+    USER
     http_proxy
     HTTP_PROXY
     https_proxy